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  <title>Description of grad_of</title>
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<h1>grad_of
</h1>

<h2><a name="_name"></a>PURPOSE <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
<div class="box"><strong>grad_of - computes the gradient of the function .5*||Fx-y||_2^2,</strong></div>

<h2><a name="_synopsis"></a>SYNOPSIS <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
<div class="box"><strong>function [ g ] = grad_of( x, y, F, Ft ) </strong></div>

<h2><a name="_description"></a>DESCRIPTION <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
<div class="fragment"><pre class="comment"> grad_of - computes the gradient of the function .5*||Fx-y||_2^2,

 where:

   - F and Ft: Linear operator and its transpose</pre></div>

<!-- crossreference -->
<h2><a name="_cross"></a>CROSS-REFERENCE INFORMATION <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
This function calls:
<ul style="list-style-image:url(../../../matlabicon.gif)">
</ul>
This function is called by:
<ul style="list-style-image:url(../../../matlabicon.gif)">
<li><a href="solve_fb_bt.html" class="code" title="function [sol, crit_ncFB] = solve_fb_bt(y, param)">solve_fb_bt</a>	solve_fb_bt - solve the following problem</li></ul>
<!-- crossreference -->



<h2><a name="_source"></a>SOURCE CODE <a href="#_top"><img alt="^" border="0" src="../../../up.png"></a></h2>
<div class="fragment"><pre>0001 <a name="_sub0" href="#_subfunctions" class="code">function [ g ] = grad_of( x, y, F, Ft )</a>
0002 
0003 <span class="comment">% grad_of - computes the gradient of the function .5*||Fx-y||_2^2,</span>
0004 <span class="comment">%</span>
0005 <span class="comment">% where:</span>
0006 <span class="comment">%</span>
0007 <span class="comment">%   - F and Ft: Linear operator and its transpose</span>
0008 
0009 x=x(:);
0010 N=size(x,1);
0011 n=round(sqrt(N)); m=n;
0012 
0013 g=Ft(F(x))-Ft(y);
0014 
0015 g=g(:);
0016 
0017 
0018 
0019 <span class="keyword">end</span>
0020</pre></div>
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